Lightroom Mobile (Android): Keep the original filename.
When exporting image in Lightroom Mobile (Android), it renames the original filename to be something like*Export* which is extremely inconvenient and annoying. Especially when you export hundreds of images on the mobile, you lose the track of which image is what. Keeping the original filename is "logical" and convenient. Also, it'll eliminate the need for a second and needless export on the desktop version in order to have the original filenames!